/*
 * Copyright 2025 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.resolve

import org.cangnova.cangjie.psi.CjBlockExpression
import org.cangnova.cangjie.psi.CjExpression
import org.cangnova.cangjie.psi.CjPsiUtil

open class StatementFilter {
    open val filter: ((CjExpression) -> Boolean)?
        get() = null

    companion object {
        @JvmField
        val NONE = object : StatementFilter() {
            override fun toString() = "NONE"
        }
    }
}

fun StatementFilter.filterStatements(block: CjBlockExpression): List<CjExpression> {
    if (filter == null || block is CjPsiUtil.CjExpressionWrapper) return block.statements
    return block.statements.filter { filter!!(it) }
}

fun StatementFilter.getLastStatementInABlock(block: CjBlockExpression) = filterStatements(block).lastOrNull()
